* FDCloser is private, so it should live in BPackageKit::BHPKG::BPrivate
* adjusted 'package' binary to no longer use FDCloser (trivial)
* minor cleanup in command_extract.cpp
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40329 a95241bf-73f2-0310-859d-f6bbb57e9c96